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1.
to stand up on hind legs (in the case of animals)
The dog reared up and licked my hands with his floppy tongue.
by citizen of the world June 23, 2005

Words related to rear up

erection fox hard on innie pip reared up
 
2.
to lose it with somone in a moment of anger
he totally reared up at me...
by amber November 26, 2003